n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 3 |
4 | 3 |
5 | 3 |
6 | 36 |
7 | 78 |
8 | 129 |
9 | 685 |
10 | 2043 |
11 | 4554 |
12 | 17233 |
13 | 57279 |
14 | 153045 |
15 | 509848 |
16 | 1724739 |
17 | 5117643 |
18 | 16445555 |
19 | 55165536 |
20 | 173225715 |
21 | 555899673 |
22 | 1847495415 |
23 | 5971507824 |
24 | 19333284247 |
25 | 63975307425 |
26 | 209807070669 |
27 | 685973054145 |
28 | 2269660792842 |
29 | 7501194321663 |
30 | 24725092907853 |
[1,0,0,3,3,3,36,78,129,685,2043,4554,17233,57279, 153045,509848,1724739,5117643,16445555,55165536, 173225715,555899673,1847495415,5971507824, 19333284247,63975307425,209807070669,685973054145, 2269660792842,7501194321663,24725092907853] |